That's funny you mention that, the keyboard I mentioned in my post with the pandas was a GMMK Pro with Mito Lazer, so very similar to what you are using, so very familiar with what you are working with.

If you are going to for a silent switch, the U4s is definitely your best bet, and would definitely check the boxes in terms of quiet switches. The only thing I'll note is that they are truly a silent switch, even quieter than my buddy's Filco with silent reds. This means there is minimal thock, if any, to really speak of. Now, this is perfect for a work keyboard, but I wonder if it maybe goes too far, so you aren't even getting the "subtle tactile sound" you are looking for. Typing on them atm, its basically nonexistent because it's so good as a silent switch. I think you may be happy with the lubed Drop X, they are quieter than the lubed pandas but still retain that nice tactile sound. But, they aren't exactly cheap.

I'm personally not a fan of sound tests online since there are always way too many variables to consider, but that may be helpful if you are on a tight budget. You may want to consider ordering at least some U4s to see if they fit the bill before you invest in a full set, but if you are ever going to be in the market for a work keyboard, they basically cannot be beaten, so I don't think you'd regret your purchase regardless.